High quality chrome-molybdenum alloy steel. Lifetime guarantee. Extra large markings for quick identification. This 14 piece set contains: 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8", 1-1/4", 1-5/16", 1-3/8", 1-7/16", 1-1/2" and 1-5/8". Molded storage case.